rowland



(No Model.) 3 Sheets-Sheet 1.

T.- P. ROWLAND.

7 Valve. Nb. 235,383. Pa'tented Dec. 14,1880.

863% H I 6A%i%fi?% runsns. PHOTO-UTNOGRAPHER, msrilmamau. a. Q

(No model.) a Sheets-Sheet 2.

T. P. ROWLAND. Vfalve.

No.235,3 83. Patented Deq.14 18 8O.

".FETERS. MOTO-UTHOGRAPHER. WASHINGTON. D C.

' leaving said passage entirely clear.

' UNITED STATES PATENT OFFICE.

THOMAS F. ROWLAND, OF NEW YORK, N. Y.

VALVE.

SPECIFICATION forming part of Letters Patent No. 235,383, dated December 14, 1880.

Application filed August 2, 1880. (No model.)

To all whom it may concern:

Be it known that I, THOMAS F. ROWLAND, of the city, county, and State of New York, have invented a new and useful Improvement in Valves, of which the following is a full, true, and exact description, reference being had to the accompanying drawings.

The object of my invention is to make a valve which can be very quickly opened, can be made absolutely tight, and at the same time, when opened, will leave the passage entirely unobstructed.

My invention is particularly applicable to valves for preventing the passage of gas. The valve itself is a double valve closing against two seats,-thereby insuring greater certainty and tightness. When opened the entire valve mechanism is withdrawn from the passage, My valve, however, is not slid out in the manner of a slide-valve, but is in the first place withdrawn from its seat laterally, and is then elevated and withdrawn entirely from the passage. In seating the double valve a wedgermovement is employed in order to cause it to rest firmly against its seats The withdrawing motion is occasioned by a doublescrew mechanism, which greatly multiplies the lon gitudiu'al movement of the valve-stem.

My invention will be clearly understood from the accompanying drawings, in which similar letters refer to similar parts.

Figure 1 represents a perspective view across the valve-chest, the outer casing being partly broken away to show the valve-operating mech anism. Fig. 2 represents a section at right angles to Fig. 1, showing the valve closed; Fig. 3, a similar section showing the valve open.

The valve casing or chest is represented generally at B, showing suitable connections for the gas-pipes, and it is provided with an upper chamber, V, (shown fully in all. the drawings,) into which the valves A are withdrawn when opened. These valves are round plates A A, seating at S S S S, as shown in Fig. 2, and they are withdrawn into the upper chamber, V.

The stem, which does not itself rotate, is elevated by a hand-wheel, D, which wheel is provided with a low-pitch screw, F, screwing into the support E. This hand-wheel D retWo on each side.

volves a tube provided with an inner screwthread, which engages with a screw-thread, G, out upon the valve-stem (3, of verymuch higher pitch than is the screw-thread F. The result is. that turning the hand-wheel D in the first place elevates itself by the elevation of the screw-thread F, thereby raising the valve;

and, secondly, causes the stem 0 to be very rapidly moved by the screw-thread G.

Attached to the lower end of the stem 0 is the double wedge-block H and the fixed collar or shoulder 0.

Fast to the wedge-block H are four pins, M,

These pins slide in diagonal or slanting slots N in lugs K, attached to the valves, one lug being situated on either side of the central line of each valve. Furthermore, two loose wedges, J J, are carried in the valve, having pins passing through lugs L in said valve, which pins or rods are adapted to bring up against the base of the valve-chest and to firmly close the valves, as will be explained.

The upper chamber, V, is provided with two slides, R, between which and the sides of said chamber the valves are loosely held when they are raised.

The operation of the valve can now be readily understood. The valve being in the position shown in Fig. 2, suppose the hand-Wheel to be turned so as to elevate the stem 0, the first result will be that the wedge-blockH will leave its contact with the wedges J, which have forcibly seated the valves, the pins M,

rising in the slanting slots in the lugs in the valves, will withdraw the valves from their seats, and the block H, coming in contact with the metallic arms or webs W, as shown in Fig. 3, will take up both the valves together and raise them entirely free of the gas-pipe. A continued elevation of the wheel in Fig. 3 will raise the valves A A into the chamber V and leave the pipe entirely unobstructed. On reversing the movement of the wheel the apparatus will once more come into the position shown in Fig. 3. On further depression the valves will be lowered opposite the seats S S S S. The continued depression of the valvestem 0 will then throw the wedge-block H against the wedges J J, the stems of which have brought up against the bottom of the valve-chest, thereby, in combination with the pins and slots M N, causing the valves to spread or separate and to be firmly seated against their seats. The valves themselves pressed by a stem and two sliding wedges, one attached to and movable in each valve, which movable wedges engage with the single central wedge when depressed byits stem,for

i the purpose of closing the double valve, suhstantially as described.

THOMAS F. ROWLAND.

\Vitnesses S. F. SULLIVAN, GEO. W. MIATT. 

